GE 90-30 PLC Series Installation And Hardware Manual page 359

B
Location in System
The RS-422/RS-485 to RS-232 converter is a free-standing device which requires two cables as the
connections between the PLC and the programmer. Its location is limited only by the length of the
connecting cables as listed in the interface specifications. The cable at the PLC end that connects
to the RS-422/RS-485 connector on the converter can be up to 10 feet in length (without an
external source of +5 VDC) and up to 1000 feet (300m) in length with an external source of
+5VDC. The cable from the RS-232 connector on the converter to the programming computer's
serial port can be up to 50 feet (15m) in length.
Figure B-1. Front and Rear View of Converter
Installation
Installation of the RS-422/RS-485 to RS-232 Converter consists of connecting two cables. Select
the proper cables for your installation. Prewired cables (see below) are available from GE ,
or if cables of different lengths are required by your application, you can build your own cables.
Specifications for building these cables are provided later in this appendix.
You do not need to connect an external source of power to the converter for a cable length of 10
feet, or less, since the necessary power connections of +5 VDC and signal ground are derived from
the PLCs backplane bus through the cable which connects to the Series 90-30 or 90-70 PLC.
1.
2.
Installation of these cables should be done with the PLC powered-down.
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B-2 Series 90-30 PLC Installation and Hardware Manual – August 2002
FRONT VIEW
G E Fanu c
IC690ACC900A
CABLE ADAPTER
MADE IN USA
Select one of the three RS-232 compatible cables (10 feet in length) that will connect the
programmer's (or other serial device) RS-232 serial port to the RS-232 port on the converter.
The catalog numbers of these cables are: IC690CBL701 (use with Workmaster industrial
computer, or IBM PC-XT or compatible personal computer), IC690CBL702 (use with IBM
PC-AT or compatible personal computer), and IC690CBL705 (use with Workmaster II
industrial computer, or IBM PS/2 or compatible personal computer).
A standard 6-foot cable (HHP compatible) is available to connect the RS-422/RS-485 port on
the converter to the RS-485 port on the Series 90-30 or Series 90-70 PLC. The catalog number
of this cable is IC693CBL303.
Connect the 25-pin male connector on the 10 foot cable to the 25-pin female connector on the
converter.
REAR VIEW
GFK-0356Q